Abstract: In order to study the characteristics of pneumatic conveying of cut tobacco in depth,a wind tunnel test system was established.The analyzed results of velocity and turbulivity test data showed that the stability coefficient of air current of the test system was less than 0.005,which indicated that the wind tunnel had good uniformity and stability.The test results of 4 brands of cut tobacco in the conical test section showed that:1) the design of wind tunnel test system was reasonable and in accord with the requirements of tobacco flow experiment;2) the floating velocity of cut tobacco performed in the form of a probability distribution curve,the slope of the curve raised relatively slowly at lower air velocity(Re<1.5×10⁵),it increased steeply when air velocity reached into a certain range(3.0×10⁵ >Re >1.5×10⁵),the slope diminished and flattened gradually at higher air velocity(Re>3.0×10⁵);3) the floating velocity of short cut tobacco(shorter than 2.5 mm),which accounted for about 5% by weight of the test sample,was lower;that of non-tobacco-related materials(NTRM) and clustered cut tobacco,which accounted for another 5% of the test sample,was higher;that of regular cut tobacco,which accounted for about 90% of the test sample,was between the previous two;4) Re ranged from 3.0×10⁵ to 4.0×10⁵ was the region where the separation of tobacco from NTRM took place under this experimental conditions.